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rbd: Support BDRV_REQ_ZERO_WRITE for truncate
Our .bdrv_has_zero_init_truncate always returns 1 because rbd always 0-fills; we can use that same knowledge to implement BDRV_REQ_ZERO_WRITE by ignoring it. Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <20200428202905.770727-5-eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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@ -817,6 +817,9 @@ static int qemu_rbd_open(BlockDriverState *bs, QDict *options, int flags,
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}
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}
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/* When extending regular files, we get zeros from the OS */
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bs->supported_truncate_flags = BDRV_REQ_ZERO_WRITE;
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r = 0;
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goto out;
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